Most modelling software does not do a good job with reverse fed towers because the model impedance to ground at the base is much too low and the model will have too much current in the section of the
Don, The question specifically stated the need to control an Icom AH-4 tuner. The Icom tuners require +13.8V and ground (which can be supplied via a bias T) but they also require control lines "start
The model used for the yagi is far from optimum and contains losses not likely to be present in a well designed antenna. The losses in a half size element are typically less than 0.5 to 1 dB unless t
Essentially 30 feet plus whatever "clearance height" you need above ground. If you want 8 - 10' clearance for dear/animals, figure on a 40' mast. Note, the extra height also increases the guy radius/
I've checked that manual twice (the version I had downloaded some time ago and the one on the web site) and there are only two diodes on the control board. Are you confusing the terminal locations: 1
If you have LEDs on the front panel of the controller for CW, CCW and brake the controller is actually from the Tailtwister - check that schematic. Those diodes (CR3, CR4, and CR5) would be the same
My question is if water can get into the RG6 coax through the outer cover ? The RG6 I'm using is Commscope but it's not the flooded ! I lay the coax on the ground to a HI-Z Receive 4 SQ , so I can re
I could do a full size 40 meter dipole. This was my original plan before deciding I wanted to see if 30 meters could be included. I still may end up going back to this. If you can do a full size 40
Unless the entire property is fenced and posted, I don't think I would run *any* cables at four feet above ground. The chance of an accident is simply too great - along with the nature of the injurie
How is the driven element constructed/insulated and matched? The downward shift indicates increased capacitance across the feed point when the antenna is wet. Look for moisture to be trapped in the D
I suppose with some trig you could figure the total projected area at various wind angles. One going down and one going up. Would some angle that gives equal projected area from each figure be the ma
I used 45 degrees here because the element and boom components were nearly the same. If one had long boom 6 or 10 meter antennas it would probably be necessary to solve for the angle of maximum force
Stick with the switch that uses enclosed relays with higher impedance coils. The "open frame" relays (even with a carbonate cover) with low impedance coils (higher current) are more sensitive to corr
One would expect that the amount of "detuning" would be related to the overall "Q" of the antenna. Antenna designs with critical element tuning - particularly DE/D1 - will detune more than designs op
SW....heading to the NE, all the forces off all the els will be due With quartering winds (winds not perpendicular to either the boom or mans), you have forces on the mast/tower to the north due to t
Jim has no basis on which to evaluate the microHAM unit since he could not bully microHAM into giving him one. The number of microHAM 6 x 2 and 6 x 10 units that have replaced other (failed) switche
No, you wanted a unit but were unwilling to buy it. As a distributor I do not have "evaluation units" and will not sell a "B Stock" unit as new (and will not turn a new product into "B stock" by allo
Do you mean Telex/Hy-Gain DB-1015? Try: <http://www.hy-gain.com/Downloads/index.php?productid=DB-1015&filename=DB-1015.pdf&company=hygain> 73, ... Joe, W4TV On 4/27/2016 10:01 AM, Bill (KC4AA) Mills
Looking at DX Engineering's "Hot Rodz" capacity hats and Hustler mobile coils, it would seem that one could design a rotatable dipole of any arbitrary length by selecting the appropriate capacity hat
According to the A3WS manual, the turning radius of the base antenna is 14' 4". The 30 meter extension (A103) manual says the driven element of the modified antenna becomes 33' 2" long. Since 33' 2"